Regulating turbines.



Patented June 3, 1913,.

W. KIESER.

REGULATING- TURBINBS- APPLICATION TILED 001a, 1912.

'IIIIIIIII/mV 'll Inventor Walter Kleser', by 1% His Attorney.

UNTTED STATES PATENT OFFICE.

WALTER KIESER, OF CHARLOTTENBURG, GERMANY, ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

REGULATIN G TURBINES.

Specification of Letters Patent.

Application filed October 5, 1912.

To all whom it may concern Be it known that I, WALTER Krnsnn, a citizenof the Swiss Republic, residing at Charlottenburg, Germany, haveinvented new and useful Improvements in Regulating Turbines, of whichthe following is a speclfication.

This invention relates to elastic fluid tur-- bines, and especially tothose which are driven normally by low pressure or exhaust steam, butare provided with means for supplying live or high pressure steam whenthe exhaust steam is unable to carry the load.

The object of the invention is to provide a regulating device whichdepends upon fluctuations in the pressure or quantity of the exhauststeam to maintain a substan tially uniform. speed of the turbine undervarying conditions of steam supply.

111 the accompanying drawing, Figure 1 represents diagrammatically asimple embodiment of my invention. Figs. 2 and 3 are diagrammaticillustrations of more elaborate systems involving the same inventiveidea, and Fig. 1 is a conventional representation of a mixed pressureturbine.

Taking up first Fig. 1, the high pressure or live steam is controlled bythe throttle valve 1, and the low pressure or exhaust steam by thethrottle valve 2. The stem of the valve 1 is pivoted to one end of afloat-- ing lever 8 fulcrumed at at on one end of a lever 5 whose otherend is controlled by a speed-responsive device 6 driven directly orindirectly by the turbine to be regulated. The other end of the lever 3is pivoted to the stem 7 which terminates in a cylinder 8 containing apiston 9 whose rod 10 is connected to the exhaust valve 2. A spring 11in the upper part of the cylinder 8 exerts downward pressure on thepiston 9, whose underside is exposed to the pressure of the exhauststeam, conveyed to the cylinder through the pipe 12. Connected with therod 10, preferably by means of the. rigid arm 13, is a spring 14, whichis also attached to one end of a lever 15, whose other end is pivotallyconnected with the stem of the throttle valve 1. The speed governor 6controls both throttle valves, the live steam valve 1 being normallyclosed. hen the speed of the turbine increases abnormally, the sleeve 16of the governor rises and the floating lever 3 is depressed. The valve 1being closed, the lever pivots at the point 17 Patented June 3, 1913.Serial No. 724,032.

and the composite stem 7, 10 of the low pressure valve is pushed down,stretching the spring 14 and throttling the exhauststeam to check theexcessive speed. Conversely, when the speed falls below normal, thefloating lever is lifted, opening the low pressure or exhaust throttlevalve 2 until it is practically wide open, when the live or highpressure steam valve 1 also begins to open to supplement any lack in thesupply of low pressure steam. All this time the pressure of the exhauststeam is assumed to be constant. Now, if the pressure of the exhauststeam falls, then the spring 11 is relieved, and the piston 9 is forceddown, thereby increasing the effective length of the valve stem 7, 10and partly or wholly closing the exhaust throttle 2. By the downwardmovement of the rod 10, however, the spring 14 is put under a greatertension, and tends to open the live steam throttle 1, whereby, throughthe oscillation of the lever 3 about the pivotal point 18, the sleeve 16of the speed governor is depressed. By this means the number ofrevolutions of the turbine is maintained at normal, in spite of theadmission of live steam. In other words this arrangement avoids a changein speed of the turbine in passing from low pressure to mixed pressureoperation and vice versa.

In Fig. 2 are shown the same live steam and exhaust steam valves 1, 2,but the former is actuated by a hydraulic motor 19, whose pilot valve 20is controlled by the speed governor 6 and lever 21, and whose secondaryregulator 22 operates also a lever 23 which is connected to the stem241-, 25 of the valve 2. The exhaust pressure acts in the device 26 tocontrol the oil supply to the space between the two abutments 27, 28 inthe cylinder 29 connected respectively to the two portions 21, 25 of thestem. To the lower portion 25 is attached a rod 30 which is pivoted to alever 31, fulcrumed at 32 and hearing at its other end on a spring 33,which exerts a downward pressure on the lever 21, the pilot valve 20 andthe sleeve 16 of the speed governor 6. The spring pressure is thusvaried in accordance with the pressure of the exhaust steam and thevariation in the effective length of the stem 24, 25, and this variationis communicated to the governing devices, so that here also as in Fig.1, no variation of the number of revolutions of the turbine will occurin changing from operatingby exhaust steam to operating by live steam.The oil pressure in thecylinder 29 may alsobe utilized-to vary thetension of the compensating spring instead of the rod 30 and lever 31.This is accomplished by running a pipe 3et'from between the abutments27, 28 to a cylinder 35 in which works a piston connected to said spring38.

The construct-ion shown in Fig. 8 embodies a further modification of thebasic idea above set forth, showingthe devices of iF gs. 1 and 2combined with mechamsm which forms the subject matter ofmypendapplication filed February 7, 1912, Se-

rial No. 676,052. In view of the-explanationsgiven in this application.and theaforesaid;pending applicatioinit is not thought necessary toenter into a detailed description of this figure.

In .accordance with the provisions of the patent statutes, Ihavedescribed the principle o'f-operation of my inventiomtoget-her with theapparatus which I now consider to represent the best embodiment thereof,but

I: desire to-have it understood that the apvpensating effect upon thespeed governor,

whereby the number of revolutions of the turbine Wlll remain constant.

2. I11 a turbine, the combination with the live steam valvemechanism andthe exhaust steam throttle valve, of a speed governor controlling both,a stem tor the exhaust valve composed of separate parts, means wherebyfluctuations of the exhaust steam pressure can vary the efi'ectivelength of said stem, and means whereby said variation can exert acompensating effect. upon the speed governor.

3. .In a turbine, the combination with'the valves for liveand exhauststeam, ot a stem forthe exhaust valve composed of two separable parts,means whereby fluctuations of. the exhaust steam can vary the distancebetween said parts, a lever connected to that part of said stem whichcarries the valve, and operative connections whereby said lever canexerta compensating eltect upon the speed governor.

.In witness whereof, I have hereunto set my hand.

VAL ER KIIQSER.

IVitnesses CARL Rrrrnn, .LUDWlG CUBnLio.

vGopiesaoi this patent may be obtained for=five cents wach, byaddressing the Commissioner of Patents. .Washington,:]). 0.

